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7178 Aluminum vs. C87800 Brass

7178 aluminum belongs to the aluminum alloys classification, while C87800 brass belongs to the copper alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7178 aluminum and the bottom bar is C87800 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
110
Elongation at Break, % 4.5 to 12
25
Poisson's Ratio 0.32
0.33
Shear Modulus, GPa 27
42
Tensile Strength: Ultimate (UTS), MPa 240 to 640
590
Tensile Strength: Yield (Proof), MPa 120 to 560
350

Thermal Properties

Latent Heat of Fusion, J/g 370
260
Maximum Temperature: Mechanical, °C 180
170
Melting Completion (Liquidus), °C 630
920
Melting Onset (Solidus), °C 480
820
Specific Heat Capacity, J/kg-K 860
410
Thermal Conductivity, W/m-K 130
28
Thermal Expansion, µm/m-K 23
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
6.7
Electrical Conductivity: Equal Weight (Specific), % IACS 91
7.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
27
Density, g/cm3 3.1
8.3
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 150
44
Embodied Water, L/kg 1110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
130
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
540
Stiffness to Weight: Axial, points 13
7.4
Stiffness to Weight: Bending, points 45
19
Strength to Weight: Axial, points 21 to 58
20
Strength to Weight: Bending, points 28 to 54
19
Thermal Diffusivity, mm2/s 47
8.3
Thermal Shock Resistance, points 10 to 28
21

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0 to 0.15
Antimony (Sb), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.6 to 2.4
80 to 84.2
Iron (Fe), % 0 to 0.5
0 to 0.15
Lead (Pb), % 0
0 to 0.15
Magnesium (Mg), % 2.4 to 3.1
0 to 0.010
Manganese (Mn), % 0 to 0.3
0 to 0.15
Nickel (Ni), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 0.4
3.8 to 4.2
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 0
0 to 0.25
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
12 to 16
Residuals, % 0
0 to 0.5